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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f778b9d628059ae9a52d12f3ed396a0cd0e952dc927c48c74d794d4a65ca42b' 
  AND token = 'M3jgUSW70TtaLN97x0KCczq6wHt0dCG9iP46h7Hs0d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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