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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1245a66fee8650ca1e4d3869358b4e29739e74f73695f70c82d7cce8ccc9e11' 
  AND token = 'nOLGiNldgBg80QwXnJqx/LdwS7X63nr/U3n2If2aL7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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