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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00d77ec7e24b2c4cee46e5b5abacb7d94bd389255f9000bdae3b8bc293735e6' 
  AND token = '5PE5m5oKZDmmN1PdR8ahwNsshr3B68j24jbPAUirND0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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