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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc9951126d97a97af0cfb2880a1b9e5d6f979b30b81f479a32c74b9c63b5f48' 
  AND token = '6T1YYAQ30gEDEjg92IvPDYWSgmkQPZmLFlKjn9Trd2o=' 
  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"
    }
  }
}