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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74b6129d5a3de2f0d480dc1c02d75af6d0de272bb0efab69f337a1e2dff40c8' 
  AND token = '70T2E+Dufn7SOJS4loR4oRSSdv+NHBv2NIVgeiCLTNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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