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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bdc04a95d78afec72deeff90d77c19ee764aa7b7374e0a94bf2256a98168ed' 
  AND token = 'pKDFhd7Tupj+zVISepgXMUKVLOn4tP4hm/Ky3Z9WgOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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