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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0ac6b6c6acfa605d6c5ad9a191713f98be2d5cdcd3a38ccb26350eb1d87eb2' 
  AND token = 's2kAhvD7Rabuq1ggvEoiPW8kYXlEpifu8Q9uBaU2So8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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