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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a501b5a4a5f6cd96a362f53ce1ca942a1a44cb8e015baffefbd6851e588656' 
  AND token = 'b44mrukSR2irjb0yQVIo/m0G2IIDubwS59k4cZ1ER64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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