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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173678c518dac985df1a6b2195d0a3d2f25eb33f4b5f21fb33e4d0f2f0ae867a' 
  AND token = '2CIRB5Cy0ubUi6BM3z9M1txeAhxwkZfJDSq0MUWPIEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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