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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db9854a8cb4b4bd21d3834e7ff83197d6eae1cb9bccd6dadedef307152b77be' 
  AND token = 'mEHV68mfCXi3IXiw6fH/d1P7wclNWuPo/LUuclbZbPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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