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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02506c1c0bd6796b81ae3bacef1f62048d39e86c1b758d8276ae10b14a006b70' 
  AND token = 'C2W5n9pd36x6R0jiftTej99bF3rz1138ItkN+FI5yJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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