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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebd18b5b3b823874ecd9673ec5e237411271eec91a0e3a798ed0b592aebdb7e' 
  AND token = '9kRNu7YpB+bOElAh5vr9CA/rUtSlj45OHcsXRPvcHeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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