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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5b1ae2ecaf155b4cca5eb84aac82e80a8c7f2664429856c8a746ed42e3b9f6' 
  AND token = 'wHdAK9fvHCO5mU74nXblhMZ6i9Mf4v1CidMrAH0ebTo=' 
  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"
    }
  }
}