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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ed0cd988f8f5d950f99c7f56fa4e4e4e3c6bd797c6819b8eb987f083fed538' 
  AND token = 'X1DxmqWspLzzLFrMY/7Gw3+n32PAm8mkkryyu137mYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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