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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad76f697abaebb838b1d902e02554e370b39ef2bea5f9daf3b9693e0505ff67' 
  AND token = 'mK0ry5nHM4/7a03W6mfzuwOYionlgoqWgpEKWbyaiIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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