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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401e859b6c746b251ef65677b3348063851da2b4c2bf2d3ea3c6542dc1036524' 
  AND token = 'Chpiw2b8z74l2uvmLS/EXn651qsEoaJPzg1Kbo2CJYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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