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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05acc63bba5250ebc31718cafeb60a2dd7ed997ab34719cdca1ed860aadcb37e' 
  AND token = 'rS1u0GITQ3D8BLEI0nWupCL5Bd32AaQt1o8c1lQvT8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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