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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9eda88b7d2e7d36aba7f1c790f1f92b957621dde5f3e12213251ba57ea72b5' 
  AND token = 'OZeOcljjIQETv1+3vpLPBC4WATUizjEVa9OepBxxPRM=' 
  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"
    }
  }
}