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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea9519354d89de6e1a9086bc91686140e46f77dfe6f16f9fddcb8e351cc6369' 
  AND token = 'eTHmPDEtQyo3AQG0rfNOCwVaJ+4iJEWPdZHbbxpK1Tc=' 
  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"
    }
  }
}