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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb86ac66aa04e4562fff0ac3c19065df8521ec0364365f684611afb346d6c46' 
  AND token = 'z2+2LSNSLzLm+voV6W6M/4y2u+Gkf4FnlQARSj1jpds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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