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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a67983607b326cd2c944ae2bb8d253d7e3d9789273e53abd6fac0cba4f40b7c' 
  AND token = 'UcjOH8ILXApQAv0fkiBI5lSWyGuXk7JNbxDZkL96510=' 
  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"
    }
  }
}