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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc19ff9106e91b4b78d94327b077af94f66afee91cc2a6b69ef6b21a408e373' 
  AND token = 'Qoh9E+b0JezfZsOZjpgmrrz2GMJsZD0MfUfl2XacCCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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