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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2e98bf08562f6701234caf1ce1d76cbfd262822d3e5f73ca09c1ea7983593d' 
  AND token = '1ctVPR4I3vqZmPa9XxmnRGagZZTV+9ob1jrEg9l2YH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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