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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009c5fd3c344d0f4a478a064171b7359d2779a7ba2baaf34306383b553f772fb' 
  AND token = 's0C+sZ66fNTKVM8bDt2xgOiicnHVmWJKOX+FKXB8OM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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