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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957fc3a2efe00c11b55776b85117ef196fffed77290209581ad1c6a04a7105db' 
  AND token = 'ga05dzPTcF7LyvgkAA328uct5yXamVM1Q6nXvvN458s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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