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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe53dc153c32324277cf3d3a16c2e002bb55689cc20c9def02edf434ba3e27ce' 
  AND token = 'VlxOho8Pvx3Cp2OKT5nEGY9/ERFk4ATZOs3GPHD+ims=' 
  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"
    }
  }
}