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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e8a7b07771a5f49d8534b995cd7f529e41d8e1df9f269c013b34cd88f38b15' 
  AND token = 'dVQGs8tet3aOgtlgHfDrFlRnKGOSHy01mIkli0A/5ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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