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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8137f998bc129f30d193ac80a68f0452fff14687e4dcce7a405d410b04aa5078' 
  AND token = '4tgGu6rkoaRfF0UMo2h2RCL3t/2jEEt1EZiLXmm49n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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