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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57927376c99775b6e2c219e4d2982007406d5442dc014f3678bae2d14b1b5c49' 
  AND token = 'gST/+pb25yVE0sgrV6PBy3qX/xN0OgyqH2zc6ILkUCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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