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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a553492e03b975a13000bc23dcb8d6bd42194d339e638e7bbc5c5c93095b1bb' 
  AND token = 'l/ttuy/4VfAnbI4l3IvP0uawbxg9x5wjEICio9Xz974=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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