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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9547d3d3a83838b8c50e6972d0355977a16513aa61b3778fb0ae13975f93cce' 
  AND token = 'fXcmOXl40gaEVfycs+R4pf3MazrW6RHds28RAdRjD0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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