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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16a3d99933350410729717e63584ba474711dff446203095d7a0bf2eb9bcbe5' 
  AND token = 'hNPDw11fYPOsApFGynsGpLz8VW68gluI81eypp3tWTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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