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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9175e6ba11bd3f181413f0b5004ab8e490e5a455fb1da7f81a6364aba3e2ea1' 
  AND token = 'U6YReHn+j1Yr0A3HOfDLja0ZvSag9X310nQcRyltjLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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