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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a08b4f5b5e1e5035dcda3fe75a3c9bc57f7857a4210faacfd4bdc739a64b5c6' 
  AND token = 'jf0P4m7C382UiQyeRuoHRc+uwhrP4MMPIeyHMW/8vzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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