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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abed83143a1adcd0a9d30c57648755b4b21856f69bc2792546760fd6364ec5a' 
  AND token = '9jnVEDGS5P2SNdiSNbGRyFQhAWHMm6ZLOELH8cRZ3AU=' 
  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"
    }
  }
}