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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6dd59568f089bcdf63a9edbfbd8dc0751f068f5f9760d2db1443800e0324337' 
  AND token = 'qBFjyni2x9YCIesCqCqhZ7fo1x3Armx+1sjrPE4Oozw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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