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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa51f5aae8c36a0280bfe0d16133d8bdc50671c9826c54e579a0f34af28c0417' 
  AND token = 'P2CywNq18uOpid6QCFqhW/AUEMMHMcbzdSAsYCA99zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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