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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa336cd806aad42769766e5493885ff83a7e9752f69a5de2b2a7c973a46ec0aa' 
  AND token = '20g6gtGsKQ7s03JuKP6p+iUBffoQHoZk2k58KVr8wyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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