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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1873637a18f32c59a0ae07cdd21ecc1286d18334513b16a0e5640e6c31ce7cd0' 
  AND token = 'V0JdeLQ20jYhtCghlOlxILGDSI45YZUC7IFCfrT6aLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}