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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab120d64e8a98cb32d4ea1ee52c4d81af2eec5f16822add4a3899dbb776d652e' 
  AND token = 'Yo8RH7okNnI/b0OF0iDVb8vOTjwgkONNlE0xA/fpN68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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