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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424f8a9f7f0463d3494dac4a9a33fb01ee262ecdb67e3d3cff66c942ffa54e09' 
  AND token = 'bjeXsaU3L1DfDZZG+PvDApHm9rdod9XfBsISbSDuQcQ=' 
  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"
    }
  }
}