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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb22fdc40ab12e145034e41f7729e014c39de50224d15f905eedb9c37d1e1e2' 
  AND token = '32NdQ0VgUriSqOl1f+cDt4n4WtK/HXsauWI8NMDj1ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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