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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fa090e7bb0b3d81e668b5345fb13f171f9bf22934509a9da9f4b1cd3bd01e4' 
  AND token = 'TLq1tPu6HNffVVlqj40OUq0k0AEH2dRZR4dMvqe6Jsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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