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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c35d3eabd7c0eac4103c40821300427e7184d6f193f53d94d7eae4989e19192' 
  AND token = 'pXGjA863r1lo6EGUCmDEA0+E//vNeee22eFCRMobnwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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