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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f417205d8416494cf57e465f65a71f1c5995c5635426b4056f0558b280b34f' 
  AND token = 'FCVr83Ph6EjBL2zxXJC0a1uwVt1KikHnmTyorNkdLAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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