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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd264e0b7dd6ca2cf6f569d18f67539fd5b07442014287ec9162e47199a2f30b6' 
  AND token = 'lQ2x+V9axa3rukuIEJ9cQ8YIOuj4bsAMrBdFvTZus8E=' 
  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"
    }
  }
}