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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9828c27eb53579a979f6618b9681c4b0971063a3e56725cf4c53ecc13e7b5f0' 
  AND token = 'CI9owF5pzWp1RGVcyuHfw2ze/do0sKie5BGc2L5twTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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